How many galaxies are there in the observable universe?
A) roughly (within a factor of 10) the same as the number of stars in our galaxy
B) roughly a thousand times more than the number of stars in our galaxy
C) about as many as the number of stars we see in the sky with our naked eyes
D) about as many as the number of grains of sand on all the beaches on Earth
E) infinity

Question

How many galaxies are there in the observable universe?
A) roughly (within a factor of 10) the same as the number of stars in our galaxy
B) roughly a thousand times more than the number of stars in our galaxy
C) about as many as the number of stars we see in the sky with our naked eyes
D) about as many as the number of grains of sand on all the beaches on Earth
E) infinity

Quizplus · Accepted Answer

The observable universe contains roughly 100 billion to 200 billion galaxies, which is roughly within a factor of 10 of the number of stars in our galaxy, the Milky Way, which has about 100 billion stars.

How Many Galaxies Are There in the Observable Universe